AI 中文总结
本研究通过pH诱导水相分离设计PEDOT:PSS:PEI薄膜形貌，缓解OECT增益-速度权衡，实现厚沟道下超低电压高性能，确立形貌为有机混合导体关键设计参数。
AI 中文摘要
有机电化学晶体管（OECTs）的性能从根本上受限于有机混合离子电子导体内部离子可及性与电子传输的相互作用。尽管增大沟道厚度可提高跨导，但也会延长离子传输时间，形成众所周知的增益-速度权衡问题。本研究表明，通过pH诱导的水相分离对PEDOT:PSS:PEI薄膜的内部形貌进行工程设计，是缓解该限制的有效途径。所得的互联孔网络促进了电解质渗透，增加了电化学可寻址体积，而DMSO处理和退火则增强了富PEDOT电子相的连续性与有序性。因此，多孔OECT沟道在沟道厚度超过100μm的情况下，仍能在超低栅极电压0.05V下实现30mS的跨导和13ms的响应时间。对具有相当电子电导率但不同孔结构的薄膜进行比较后发现，形貌是决定器件性能的主导因素，支持了从主要受表面限制的调制向空间分布的混合离子电子传输的转变。本工作不仅展示了一种可扩展的水基制备策略，还确立了内部形貌作为补充分子结构和器件几何形状的有机混合导体设计参数，为开发高性能OECT、柔性生物电子学及未来神经形态材料提供了通用框架。
英文摘要
The performance of organic electrochemical transistors (OECTs) is fundamentally governed by the interplay between ionic accessibility and electronic transport within organic mixed ionic-electronic conductors. Although increasing channel thickness enhances transconductance, it also prolongs ion transport, resulting in the well-known gain-speed trade-off. Here, we demonstrate that engineering the internal morphology of PEDOT:PSS:PEI films through pH-induced aqueous phase separation provides an effective route to mitigate this limitation. The resulting interconnected pore network promotes electrolyte penetration and increases the electrochemically addressable volume, while DMSO treatment and annealing enhance the continuity and ordering of the PEDOT-rich electronic phase. Consequently, porous OECT channels achieve a transconductance of 30 mS and a response time of 13 ms at an ultralow gate voltage of 0.05 V despite channel thicknesses exceeding 100 um. Comparison of films with comparable electronic conductivity but different pore architectures identifies morphology as the dominant factor governing device performance, supporting a transition from predominantly surface-limited modulation toward spatially distributed mixed ionic-electronic transport. Beyond demonstrating a scalable water-based fabrication strategy, this work establishes internal morphology as a design parameter that complements molecular structure and device geometry in organic mixed conductors, providing a general framework for the development of high-performance OECTs, soft bioelectronics, and future neuromorphic materials.
Commentsconducting polymer, PEDOT:PSS, porous films, organic electrochemical transistors (OECTs), ion sensing
